Should I Repair a Plinius 8150 ?

I think it would be really hard to find something as lovely as that amp for $750. I do this: I flip a coin and if the coin says the same as my gut feeling then it validates me and if the coin says something opposite to what I felt I wanted to do it highlights my inner thoughts about the repair / upgrade whatever.

As mentioned already; I'd shop around and see if you can't find a better price. Plinius makes a very good product.

Your question is "Should I repair a Plinius 8150?" and to that I would answer a hearty "yes". To replace caps is not a big deal and replacing the switch should be basic as well. Learn to solder and get going.

Study the web to see how caps are changed, practice a little soldering, buy a new switch and have at it. This is probably one of the easiest DIY things in electronics. Just be sure to discharge the capacitors before starting the job.

I read this thread days ago and had all the same thoughts as Viridian, just didn't feel comfortable saying do it yourself without experience, But now that he has said it....
open the case, take pictures of the wiring for reference, look at and measure the physical size of the caps. Get the value of the caps... i.e. 10,000mfd 50v etc.
If you can replace these caps, any good cap with the same MFD rating or higher AND the same voltage rating or higher(larger the value the better on both) that fits will do a good job.... a 10,000mfd 50v cap runs $5 to $30 USD. As Viridian said, some parts have improved, you should come away with better performance than before the repair.
Good Luck,
Tim